Assertion : The sequence of dark reaction of photosynthesis was discovered by Robin Hill
Reason: The principle of limiting factor was proposed by Calvin.

Options

A. If both Assertion and Reason are true and Reason is correct explaination of Assertion.
B. If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
C. If Assertion is true but Reason is false.
D. If both Assertion and Reason are false.

Answer

To analyze the given assertion and reason, we will break down the statements and evaluate their validity step by step.

### Step 1: Evaluate the Assertion
The assertion states: "The sequence of dark reaction of photosynthesis was discovered by Robin Hill."

- **Analysis**: The dark reactions of photosynthesis, also known as the Calvin cycle, were actually elucidated by Melvin Calvin and his colleagues, not Robin Hill. Robin Hill is known for his work on the light reactions of photosynthesis, particularly the Hill reaction, which involves the splitting of water and the release of oxygen. Therefore, this assertion is **false**.

### Step 2: Evaluate the Reason
The reason states: "The principle of limiting factor was proposed by Calvin."

- **Analysis**: The principle of limiting factors, which states that the growth of an organism is limited by the factor that is in the shortest supply, was proposed by Frederick Blackman, not Calvin. Calvin is known for his work on the Calvin cycle, but he did not propose the limiting factor principle. Therefore, this reason is also **false**.

### Step 3: Conclusion
Since both the assertion and the reason are false, we can conclude that the correct answer is:

**Both Assertion and Reason are False.**

### Final Answer
The correct option is: **4. Both Assertion and Reason are False.**

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